Your browser is out of date.

You are currently using Internet Explorer 7/8/9, which is not supported by our site. For the best experience, please use one of the latest browsers.

ASTM A709 Steel Plate

ASTM A709 is Recommended for 

ASTM A709 is a carbon and high-strength low-alloy steel structural shape, and plate. It is quenched and tempered alloy steel, for structural plates meant for use in bridges.

We will be glad to help you select the exact grade of ASTM A709 steel plate for your needs.


  • 36
  • 50
  • 50S
  • QST 50
  • QST 50S
  • 50W
  • HPS 50W
  • 50CR
  • QST65
  • QST 70
  • HPS 70W
  • HPS 100W
Get a Quote Ask an Expert

ASTM A709 Specifications

A709 is the standard specification for structural steel bridges. Covers carbon, HSLA, Q&T, and stainless steel plates, bars, and shapes for structural use in bridges. Includes grades 36, 50, 70, and 100, with designations for enhanced atmospheric corrosion resistance (W). Both fracture critical tension components and non-critical fracture tension components must meet impact requirements. These requirements are based on American Association of State Highway and Transportation Officials (AASHTO) requirements for tension components in bridges.

  • Strength, Yield Strength ksi (MPa), Tensile Strength ksi (MPa): Stronger, 58-130 (400-900)
  • Formability: % Elongation: Low for some grades, 14-21%
    For better formability consider Drawing Steel
  • Joining – Fair
    Design and welding must account for stresses.
  • Corrosion Resistance – Good   
    Galvanizing will slow corrosion.   For longer life in harsh chemical conditions, consider Galvanized or Coated Steel
  • Chemistry  Low carbon, high manganese and silicon, alloyed with copper, Chromium, Nickel, and Molybdenum
  • Cost – Higher.  
    Good when thinner or stronger steels will add value.

Explore Our Available Steel Products & Grades

Our knowledge and experience give nearly 100% accurate delivery of High Carbon, Low Carbon, Stainless Steel products processed and packaged to your exact specifications.

See All Resources

Have a Question?
Our experts can help

Give us a call at 800-348-2529 or leave us a message.

Speak to a Steel Expert